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Environmental Issues

Question

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According to central pollution control Board (CPCB), which particulate size in diameter (n micrometres) of the air pollutants is responsible for greatest harm to human health?

2.5 or less

1.5 or less

1.0 or less

5.2 or 2.5

Solution

A.

2.5 or less

Particles in the size range 1-10 μm have measurable settling velocities but are readily stirred by air movements whereas particles of size 0.1-1 μm, a submicroscopic size found in Urban air, undergo random Brownian motion reulting from collisions among individual molecules. Of all the different types of particulates in the atmosphere, the presence of trace elements such as cadmium, lead nickel and mercury may constitute the greatest health hazard.

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Which gas contributes the maximum in global warming ?

Fill in the blanks with suitable words :
1. Increase in concentration of soluble salts in the soil is called.........

2. Aforestation can check the advancement of......... .

3. DDT is a serious pollutant as it is a.........pollutant and undergoes......... .

4 .........plant has become a troublesome weed in agricultural fields.

5 .........are major aerosol pollutant present in jet aircraft emission.

Write “True” or “False” :

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